Compression router bit
The compression cutters are equipped with both up and down cutting grooves. The upper part of the cutting length closest to the shaft has a left-hand spiral that pushes the chips down. The lower part of the cutting length closest to the end has a right-hand spiral that pushes the chips upwards. When cutting, the opposite tension directions generate opposite up and down forces. The opposite cutting forces stabilise the material removal, which compacts the composite layers and thus counteracts delamination on the top and bottom of a workpiece.
Since compression cutters do not pull up or push down a workpiece, they leave an excellent finish on layered composite materials and lightweight materials such as plywood. The fact that plunge cutters are especially suitable for profiling, as the advantages of the up and down cut geometry are not used when grooving or grooving.